Silicon Microspheres as UV, Visible and Infrared Filters for Cosmetics

As is generally known, the solar radiation spectrum extends from wavelengths of 200 nm to 3,000 nm. Within this spectrum, the different types of radiation can be classified by wavelength and energy content. Ultraviolet (UV) radiation, from 200 nm to 380 nm, produces burning and erythema, in the case of UVB, or skin aging and photocarcinogenesis possibly leading to skin cancer, in the case of UVA.1 Visible light falls in the range of 380 nm to 700 nm; and infrared (IR) radiation, from 700 nm to 3,000 nm, is responsible for heat and also appears to be involved in skin aging2, 3 and cancer.4

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